RU36787U1 - DEVICE FOR WELDING THERMAL PROCESSING - Google Patents

Description

Device for heat treatment of welds

The utility model relates to the field of welding production, in particular to the heating of welded joints during welding.

A known installation for the heat treatment of welded joints of steam pipelines, developed in the OP PRP Ulyanovskenergoremont, including a power source - a welding transformer, a control unit and temperature registration, thermocouples TXA, electric heaters (magazine Welding Production No. 6 1999, p. 44). The set temperature is set by the operator on the setpoint. When the set temperature is reached, the device generates a signal - a command to turn off the welding transformer through a magnetic starter. When cooling, a command is formed to turn on the welding transformer.

The disadvantage of this device is that the temperature of the weld changes stepwise, which reduces its quality.

Known installation for heat treatment of welds NPP "Kzfay Ufa, containing a power unit including a transformer, control unit, programmer, temperature recorder, thermocouple, electric heaters, heat exposure is carried out by flexible heating resistance elements (" Heat treatment of welded joints P.М. Korolkov, Kiev, Ecotechnology, 2002, p. 35). The actual temperature in each zone is reflected and recorded by a six-channel recorder.

The disadvantage of this device is that the temperature of the weld changes in steps, the required temperature in the measurement zone is not maintained, the quality of the weld is reduced.

The proposed utility model solves the problem of maintaining high accuracy of the process parameters.

To achieve this result, a device for heat treatment of welds containing a power unit including a transformer, a control unit, a programmer, a temperature recorder, a thermocouple,

IPC 7 V 23K 37/00

electric heaters; an automatic correction and stabilization unit for the temperature of welds is additionally included.

Distinctive features of the proposed device for heat treatment of welds from the above known, closest to it, is the presence of a block for automatic correction and stabilization of the temperature of the welds, and it can be located on a mobile vehicle.

Due to the presence of these signs, high accuracy of maintaining the parameters of the technological process is ensured, the possibility of using any electric heaters of domestic and foreign production, as well as the mobility of the device, is provided.

The proposed device for heat treatment of welds is illustrated by the drawings shown in FIG. 1-3 In FIG. 1 shows a block diagram of a device for heat treatment of welds; FIG. 2 diagram shows a block for temperature correction and stabilization; FIG. 3 shows a temperature measurement circuit

A device for heat treatment of welds (Fig. 1) contains power units 1 and 2, including a transformer control unit 3, a programmer 4, a temperature recorder 5, a thermocouple 6, electric heaters (type LEG and CEN) 7, a block for automatic correction and stabilization of the temperature of the welds 8.

The device operates as follows.

Before starting work, the operator-thermist sets the necessary modes indicated in the technological process on the programmer: heating speed, shutter speed and cooling. The maximum heating rate can be set in the temperature range from 25 ° C to per hour. The range for setting the heating rate can be changed. The programmer works in automatic mode. Monitoring of the operation of the heating channel, set values and the actual temperature of the heating are displayed digitally with the help of converters of the type Ш93220ЦИ. High accuracy of maintaining the parameters of the process is ensured by the inclusion of an automatic correction and stabilization unit for the temperature of the welds 8, with which the temperature of the process is stabilized at the point of measurement. This unit controls through the control unit 3 and the power unit 2 by heating and

stabilizes the process by introducing adjustments, which allows to obtain high accuracy of the process technology, to obtain a high-quality weld.

The block correction and stabilization of temperature is developed on the basis of a software microprocessor (figure 2). This unit allows you to monitor the temperature of the product under heat treatment, while the control of the power unit is adjusted depending on the temperature increase. The input voltage proportional to the temperature is supplied to the amplifier of block B1, where it is amplified to the value necessary for the operation of the analog-digital converter B2. The B2 analog-to-digital converter converts an analog signal amplified into a digital form. The converted signal is fed to the microprocessor BZ for subsequent processing, which, depending on the input value, calculates the duration of the control pulse and feeds it to block B4. The signal of the temperature correction and stabilization unit 8 (Fig. 1) is supplied to the control unit 3, which performs phase control of the electric heater 7. The temperature correction and stabilization unit 8 operates according to the following algorithm: the temperature is measured and a single pulse of calibrated duration is supplied to the control unit, after which repeated temperature measurement is performed and the results calculate the duration of the pulse forming the necessary power supplied to the electric heaters. The reaction time to the measured temperature is minimal (Fig. C), which eliminates the overshoot process (self-oscillating) and minimizes temperature instability from a given value, while AT ° (10-15)% AT, where AT ° is a given deviation from temperature products. The regulation process is carried out continuously, thereby ensuring the maintenance of the specified heat treatment modes, high accuracy of the process parameters is achieved.

Claims (2)

1. Device for heat treatment of welds, comprising a power unit, including a transformer, a control unit, a programmer, temperature recorder, thermocouple, electric heaters, characterized in that it further comprises a unit for automatic correction and stabilization of the temperature of the welds. 2. The device according to claim 1 may be located on a vehicle.